LM3477

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SNVS141J – MAY 2004 – REVISED JULY 2004

Electrical Characteristics

(1) (continued)

Symbol

Parameter

Conditions

Typical

Limit

Units

Output Over-voltage Protection (with

50

mV

32/25

mV(min)

78/85

mV(max)

Output Over-Voltage Protection

60

mV

20

mV(min)

110

mV(max)

Gm

Error Amplifier Transconductance

750

µmho

600/365

µmho (min)

1000/1265

µmho (max)

Error Amplifier Voltage Gain

38

V/V

30

V/V (min)

42

V/V (max)

Error Amplifier Output Current (Source/

100

µA

Sink)

0V

75/50

µA (min)

130/160

µA (max)

−140

µA

−110/−95

µA (min)

−170/−180

µA (max)

Error Amplifier Output Voltage Swing

Upper Limit

2.2

V

2.0

V(min)

COMP Pin = Floating

2.35

V(max)

Lower Limit

0.75

V

0.5

V(min)

0.95

V(max)

Internal Soft-Start Delay

5

msec

Drive Pin Rise Time

25

ns

Drive Pin Fall Time

25

ns

Output = High

1.15

V

1.35

V (max)

Output = Low

0.65

V

0.3

V (min)

Shutdown Pin Current

−1

µA

+1

TSD

Thermal Shutdown

165

°C

Thermal Shutdown Hysteresis

10

°C

Thermal Resistance

MM Package

200

°C/W

(4)

The over-voltage protection is specified with respect to the feedback voltage. This is because the over-voltage protection tracks the

specification.

(5)

The COMP/SD pin should be pulled to ground to turn the regulator off. The voltage on the COMP/SD pin must be below the limit for

Output = Low to keep the regulator off.

Copyright © 2004, Texas Instruments Incorporated

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